fix(protocols/modbus): fix write requests for coils always set to fal…

…se (#710) (#711)

* fix(protocols/modbus): fix write requests for coils always set to false (#710)

* fix(protocols/modbus): Reverted modbus bool changed to 7 bit and manually implemented parsing of coil boolean instead (#710)

Co-authored-by: Stein Overtoom <stein.overtoom@triopsys.nl>

plc4j/drivers/modbus/src/main/java/org/apache/plc4x/java/modbus/base/protocol/ModbusProtocolLogic.java

@@ -272,7 +272,11 @@ protected PlcValue toPlcValue(ModbusPDU request, ModbusPDU response, ModbusDataT
     protected byte[] fromPlcValue(PlcTag tag, PlcValue plcValue) {
         ModbusDataType tagDataType = ((ModbusTag) tag).getDataType();
         try {
-            if (plcValue instanceof PlcList) {
+            if (tag instanceof ModbusTagCoil && plcValue instanceof PlcBOOL) {
+                byte byteValue = (byte) (plcValue.getBoolean() ? 1 : 0);
+                return new byte[]{byteValue};
+            }
+            else if (plcValue instanceof PlcList) {
                 WriteBufferByteBased writeBuffer = new WriteBufferByteBased(DataItem.getLengthInBytes(plcValue, tagDataType, plcValue.getLength()));
                 DataItem.staticSerialize(writeBuffer, plcValue, tagDataType, plcValue.getLength(), ByteOrder.BIG_ENDIAN);
                 byte[] data = writeBuffer.getData();